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|1. (WO2018181284) WASTE WATER-LESS EXHAUST GAS TREATMENT SYSTEM AND WASTE WATER-LESS EXHAUST GAS TREATMENT METHOD|
|Applicants:||MITSUBISHI HITACHI POWER SYSTEMS, LTD.
|Title:||WASTE WATER-LESS EXHAUST GAS TREATMENT SYSTEM AND WASTE WATER-LESS EXHAUST GAS TREATMENT METHOD|
The present invention is provided with: a desulfurization device 14 which removes sulfur oxides contained in boiler exhaust gas 12; a spray-drying device 19 which sprays desulfurization waste water 15 discharged from the desulfurization device 14 and which dries the waste water by introducing a drying gas 12a; an exhaust gas delivery line L13 which returns, to a main smokestack L11, exhaust gas 12b obtained by subjecting the desulfurization waste water 15 to evaporative drying; an alkaline agent supply part 22 which adds an alkaline agent 21 to a desulfurization waste water line L21 located between the desulfurization device 14 and the spray-drying device 19; and pH meters which measure the pH in the desulfurization waste water 15 at locations before and after the alkaline agent supply part 22 in the desulfurization waste water line L21, wherein the alkaline agent is added according to the result of a pH measurement so that the desulfurization waste water 15 added with the alkaline agent 21 has a pH value falling within a prescribed pH range.